{"id":"671c0e6e-32ef-4e16-8f79-059c179ee285","shortId":"L7yuuS","kind":"x402","title":"x402-gated premium API endpoint on Base, payable in USDC at $0.02 per request.","tagline":"x402-gated premium API endpoint on Base, payable in USDC at $0.02 per request.","description":"This endpoint is part of the lowpaymentfee.com platform, which offers a collection of x402-protocol pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. The specific endpoint at `/api/v1/stripe/charges/148` is labeled \"Premium API Access\" but its exact functionality is not documented beyond that title. The platform advertises uniform $0.02-per-request pricing across all endpoints.\n\nPayment is handled via the x402 protocol on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The probe confirms the endpoint is live, returning a 402 challenge with `maxAmountRequired` of 20000 base units, which equals $0.02 (USDC uses 6 decimals). The payment scheme is \"exact\" with a 300-second timeout. No API keys or rate limits are advertised — access is purely pay-per-call.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no description of what this particular endpoint returns or what input it expects. The `outputSchema` in the x402 challenge indicates it accepts HTTP POST but provides no further detail on the request body or response format.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","http-post","no-api-key","no-rate-limit"],"categories":["api","payments"],"synonyms":["premium API","x402 API","USDC pay-per-call","lowpaymentfee","Base network API","crypto-paid API","stripe charges API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The endpoint path '/api/v1/stripe/charges/148' suggests Stripe-related functionality but this is unconfirmed and undocumented.","No request body schema or response schema is provided; callers cannot know what to send or what to expect back.","The platform lists many endpoints but none appear to have individual documentation."],"endpointUrl":"https://lowpaymentfee.com/api/v1/stripe/charges/148","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/stripe/charges/148","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is essentially no documentation: no OpenAPI schema, no request/response examples, no description of what the endpoint actually does. The docs pages are empty beyond a wallet-connect prompt. The endpoint name 'stripe/charges/148' is opaque and 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'0.02':13,28,86,128 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':108 '20000':123 '300':140 '402':118 '6':131 'Base network API' 'USDC pay-per-call' 'accept':210 'access':71,151 'across':91 'addit':178 'advertis':84,150 'ai/ml':55 'analyt':54 'api':5,20,51,70,144,164 'base':8,23,103,124 'beyond':79 'bodi':221 'call':157 'challeng':119,207 'collect':42 'confirm':111 'connect':173 'content':179 'contract':107 'crypto-paid API' 'data':53,58 'decim':132 'descript':190 'detail':217 'doc':163 'document':78,158 'endpoint':6,21,32,64,93,113,195 'equal':127 'exact':74,137 'exampl':187 'expect':201 'extrem':160 'finance/web3':57 'format':224 'function':75 'gate':3,18 'handl':96 'http':211 'http-post' 'indic':208 'infer':56 'input':199 'key':145 'label':68 'limit':148 'live':115 'lowpaymentfee' 'lowpaymentfee.com':37 'maxamountrequir':121 'network':104 'no-api-key' 'no-rate-limit' 'offer':40 'openapi':183 'outputschema':203 'page':168 'part':34 'particular':194 'pay':48,155 'pay-per-cal':154 'pay-per-request':47 'payabl':9,24 'payment':94,134 'per':14,29,49,88,156 'per-request':87 'platform':38,83 'post':212 'premium':4,19,69 'premium API' 'price':90,165 'probe':110 'prompt':175 'protocol':46,100 'provid':214 'pure':153 'rate':147 'readm':167 'render':170 'request':15,30,50,89,220 'request/response':186 'respons':223 'return':116,196 'schema':184 'scheme':135 'second':141 'servic':61 'span':52 'spars':161 'specif':63 'stripe charges API' 'timeout':142 'titl':81 'uniform':85 'unit':125 'usdc':11,26,106,129 'usdc-on-base' 'use':105,130 'util':60 'via':97 'wallet':174 'x402':2,17,45,99,206 'x402 API' 'x402-gated':1,16 'x402-payment' 'x402-protocol':44","prices":[{"id":"8ef37b68-36e1-4889-be7b-f071711a14a8","listingId":"671c0e6e-32ef-4e16-8f79-059c179ee285","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/stripe/charges/148","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:54:01.598Z"}],"sources":[{"listingId":"671c0e6e-32ef-4e16-8f79-059c179ee285","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/stripe/charges/148","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:54:01.598Z","lastSeenAt":"2026-04-22T07:01:20.311Z"}],"details":{"listingId":"671c0e6e-32ef-4e16-8f79-059c179ee285","quickStartSnippet":"# The endpoint requires an x402 payment header (USDC on Base).\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/stripe/charges/148\n# Returns 402 with x402 challenge JSON.\n# To complete payment, attach an X-PAYMENT header with a valid x402 payment proof.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/148"},{"claim":"Platform advertises $0.02 per request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/stripe/charges/148"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a pay-per-request API without needing API keys or subscriptions","Demonstrating x402 protocol payment flows on Base network","Programmatic micro-payment API consumption using USDC"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access","Low-volume consumers who want no-commitment API usage"],"notFor":["Users who need well-documented API contracts with clear request/response schemas","High-volume production workloads requiring SLAs or support","Anyone needing to understand exactly what this specific endpoint returns before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:56.673Z"},"updatedAt":"2026-04-22T07:01:20.311Z"}}